stale pyc's cause unit tests to fail

[Matt Riedemann]

I hit this when running tox -r -e py27 on stable/juno because of stale pyc's in my environment:

Failed to import test module: ceilometer.tests.objectstore.test_swift
Traceback (most recent call last):
  File "/home/mriedem/git/ceilometer/.tox/py27/local/lib/python2.7/site-packages/unittest2/loader.py", line 456, in _find_test_path
    module = self._get_module_from_name(name)
  File "/home/mriedem/git/ceilometer/.tox/py27/local/lib/python2.7/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
    __import__(name)
  File "ceilometer/tests/objectstore/test_swift.py", line 28, in <module>
    from ceilometer.central import manager
  File "ceilometer/central/manager.py", line 40, in <module>
    class AgentManager(agent.AgentManager):
AttributeError: 'module' object has no attribute 'AgentManager'
Non-zero exit code (2) from test listing.
error: testr failed (3)
+ clean_exit
+ local error_code=1
+ rm -rf CEILO-MONGODB-Ljw5A
+ test -n ''
++ jobs -p
+ kill 11233 11283
+ return 1

We should delete *.pyc's in the tox venv before running tests.

[Matt Riedemann (mriedem)]

Fix: https://review.openstack.org/#/c/198815/

[gordon chung (chungg)]

i'm in same boat as Julien here. i think this topic was pretty divided when it was brought up[1]

[1] http://lists.openstack.org/pipermail/openstack-dev/2014-September/045845.html

[OpenStack Infra (hudson-openstack)]

Change abandoned by Matt Riedemann (<email address hidden>) on branch: master
Review: https://review.openstack.org/198815
Reason: meh